Core drill



sepf.14,1943. A R. s. MANN 2,329,405

CORE DRILL Filed June 2'?, 1940 s sheets-sheet 1 vwwv y 4 l @y 2/ Lg y 2Z-/*\r 7 l 4@ Q/J A43 m60 ./kf w8 /x 75 f1.5 f

Sept. 14, 1943. R s MANNv 2,329,405

CORE DRILL Filed June 27,'19'40 3 sheets-sheet 2 y 32 l. 2L, f

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*W www Sept. 14, 1943.

R. s. MANN 2,329,405

C ORE DRILL Filed June 27, 1940 3 Sheets-Sheet 5 www Patented Sept. 14, 1943 UNITED STATES PATENT OFFICE 2,329,405 I, CORE DRILL Robert S. Mann, Elyria, Ohio Application June 2v, 1940, seal No. 342,811

I'he invention relates to core drills and has as an object the provision of a drill oi' this character capable o1' use continuously to the end of obtain# ing a core during a complete drilling operation.

It is a further object of the invention to provide a drill having a core supporting'means capable of removing a core of loose or friable material.

It is a further object of the invention to provide a drill having core-cut-oil apparatus controllable from the drill rig iloor.

It is a further object of the invention, in some forms thereof, to provide a drill having cut oil apparatus operated by revolution of the drill when prepared for this action at will of the driller.

It is a further object of the invention to provide apparatus of this character that will tend to keep the wash uid away from the core.

Further objects will appear from the following description showing illustrative embodiments of the invention and wherein- Figure 1 is a central vertical section;

Figure 2 is a bottom plan view of a housing and core barrel connecting plate;

Figure 3 is a perspective view of la core-cutter way member;-

Figure 4 is a perspective view of a core cutter;

Figure 5 is a central vertical section taken at right angles to the section of Figure 1;

Figure 6 is a detail plan view of the drill body of Figures 1 and 5 showing the core cuttels and way member in place;

Figure 1 is a central vertical section of another form of the invention;

Figure 8 is a detail plan view of the cut-off mechanism and control means of the form of Figure 7;

Figure 9 is a perspective view of a cutter the form of Figures 7 and 8, and

Figure 10 is a detail central vertical section, showing a still further form of the invention.

As shown in Figures 1-6 inclusive, the drill comprises a drill body I5 formed with an upstanding annular flange I6 shown as both externally screw threadedat I1 and internally screw threaded at I8. To the threads I1 there is shown connected a drill stem I9.

The drill body I5 is shown as terminating downwardly in dril teeth 20 and core cutting means 2|. The form of drill and core cutting means shown is for purpose of illustration only.` Any form of iof a rigid teeth, rotary cutter, or diamond drill means the closure 2|' formed with a core receiving bore `22 in axial alignment with bore 23 formed in the drill body I5, the closure 2l' having external screw threads for coaction with internal threads To receive the core barrel 24 the closure 2| is shown as formed with an upstanding screw threaded nipple 25.

For reception of the core cutting mechanism e the closure 2I is shown as formed with a downwardly open recess 26, receiving a Amember 21 shown in perspective in Figure 3. To receive the cutters and core supporters 28, 29, the member 21 is shown as formed with dovetail way recesses 30, 3|. For operation of the core cutters 28, 29, to the closing position shown in Figure 6, there is shown a iiuid pressure conduit 32 communicating with a T-member 33, in turn communicating with conduits 34, 35, opening into sleeves 36, 31, slidably engaged in openings 38 in the bodies of the cutters.

When it is desired to sever a core for withdrawal a fluid pressure, preferably air, is applied to the conduit 32 which extends to the drill rig iloor which fluid pressure, entering the sleeves 36, 31, forces the cutters 28,-29 toward each other. The said sleeves are closed at their outer ends .and the ends abut against the wall of the recess 26.

During the cutting off operation with the cutters under in'iluence of the fluid pressure, the drill is rotated without weight applied thereto so that the teeth 38', 39 upon the respective cutters will saw off the core as they are forced inwardly and rotated. When the cutters are closed as shown in dotted lines in Figure 6, they will make a substantially tight joint for the reasonthat they are formed complemental to each other so that the teeth of each cutter t into the recess between teeth of the other cutter.

The apparatus may then be hauled out taking the core with it, and because of the tight closure of the cutters, and because the cutters stand' below the entire lower surface of the core, the core wil be removed in perfect condition even though the drilling is in a loose and friable .formation.

To prevent the cutters from being displaced inwardly during the going in of theA drill to working position there are shown spring pressed ball detents 4U, 4I housed in recesses in the body of the annular disk portion of the member 21.

To supply drilling fluid used forv the purpose of washing away chips produced in the drilling operation, the closure member 2I' is shown as formed with openings 42, 43, and the member 21 with openings 44, 45 to register therewith when assembled. To prevent undue leakage oi the drilling fluid to the core barrel which might damage the core. the holes when assembled are shown as lined with sleeves 46, 41 having screw thread engagement with the closure 2|. The sleeves and the openings containing the same are so placed as to terminate at an annular recess 48, which recess communicates with passages 48 to the zone of operation of the drill teeth, from which zone the drilling fluid will oirculate upwardly exterior of the drill stem in the usual manner. 'Ihe passages 49 are indicated as lfour in number.

In the form of the invention shown in Figures 'l-9, the drill body is shown at I5', the core opening at 23', the core barrel at 24 and 'the drill stem at I9'. In this form of the invention the drilling iluid openings 42', 43 communicate with an annular recess 48', which in turn communicates with passages 49' to conduct the drilling fluid to the zone of operation.

The core body is shown as formed with an upstanding annular ,flange i6 having exterior threaded engagement with the interior of a ring ill supplied for convenience in forming the drilling fluid openings 42'. The closure member 2|' in this form of the invention also carries the upstanding nipple 25' for screw threaded engagement with the core barrel. For operation of the cutter and core supporting members I-52, there is shown a revoluble ring |53 housed in the recess in the closure member 2|' and held in posi- -tion by an overlying shoulder 54 formed in the recess. Seated in the recess 26 there is shown a disk member Si having the outline shown in Figure 8, whereby to prevent revolution in the recess.

Pivoted upon the disk 55 by means of cap screws I8, 51 are the cutters 5I, 52' which cutters are formed with similar recesses each presenting a cam'surface 58 to the action of pins 59, 60, carried by the disk 53. It will be seen that starting from a normal position of the pins 59, 60, as shown in Figure 8, with the cutters Il, 52 in the position shown in dotted lines, rotation of the disk l! to the lei't in said figure, or counterclockwise, willcause the pins to act upon the cam surface 5l to move the cutters to the dot-dash lines shown in said figure wherein the teeth 38', l.' will mesh, theybeing formed complemental to each other as with the form of the invention first described.

To cause revolution oi the disk 53, there is rotation of the disk 53, there is shown a sleeve It, slidable in a recess 61 forming an enlargement of the bore 22' of the closure member 2i'. The sleeve is shown in cutter locking position in Figure '7. When the cutting of! operation is desired the sleeve 86 may be moved upwardly by a pull exerted upon a member 68 extending to the surface, which member is shown as terminating in a pin 69 secured to an arm 'l0 secured to the sleeve B6. All that is necessary in order to perform the cutting ofi' operation, when it is desired to come out with the drill, is to exert a pull upon the member 68 and to rotate the drill without weight thereon. The core will be entirely enclosed below. yand supported by the cutters 5I, 52 as in the form of the invention first described.

An alternative method of operating the cutters of the first form of the invention by fluid pressure is indicated in Figure 10 comprising the insertion of a cartridge employing a slow burning explosive and which may occupy as much space in the sleeves as desired. To ignite the explosive wire leads 1|, 12 are shown which may be connected to a pair of wires leading to the floor of the drill rig. In the use of this form of mechanism the core cutters and supports 28', 29' are preferably formed with cutting edges rather than with teeth, in order to more readily crack of! rock or sever rock formation.

As. stated, it is an object oi' the invention to provide a continuous production core drill. To this end the core barrel may extend to the drill rig iloor if desired. However the same end may be reached by providing a core barrel only long enough to accept a core of a length equal to the maximum distance that can be drilled without coming out for renewal or sharpening of the drill. The shorter barrel should be capped at its upper end. This will trap air which air must be forced downwardly around the core as it enters the barrel, which fact will assist in excluding drilling fluid.

Friction between the stationary core and a revolving core barrel, at times results in breaking of the core. To prevent this the invention includes the use of any well known form of swivel in common use has not been capable of supporting a long core.

Minor changes may be made in the physical embodiments of the invention within the scope oi' the appended claims without departing from the spirit thereof.

I claim:

1. A core drill comprising, in combination: a drill body formed with an axial bore and having a chamber opening thereinto; core cutting and supporting plates housed in said chamber normally in a position to leave said bore unobstructed; said plates movable to edgewise meeting engagement with each other to totally obstruct the bore means to cause movement of said plates to core-cutting and supporting position during normal operation of the drill; and means operable at the will of the operator to cause such closing movement of the plates.

2. 'I'he combination of claim 1 with complemental core cutting Yteeth carried by the respective plates, to provide a close Joint therebetween,

said teeth acting to sever a core when moved thereagainst while the drill is rotated.

3. The combination of claim 1 with uid pressure means to actuate movement o! the plates and with means accessible to the operator to initiate the movement.

4. The combination of claim'l in which the movement of the plates' is caused by fluid pressure.

5. A core drill comprising. in combination: a

drill body having a core-receiving passage and a chamber opening into said passage adjacent its inlet opening; core severing and supporting plate means housed in said chamber clear of said passage during drilling operation; means mounting said plate means for movement in its 'own plane normal to the axis of said passage to core-severing and passage-obstructing positions and means to cause movement of said plate means in a plane fixed relative to the axis of the passage to said severing and obstructing positions at the will of the operator, the obstructing area of said plate means being substantially equal to the crosssectional area of the core passage.

6. The combination of claim 5 with means operable from the drill rig oor during normal revolution of the drill to initiate core-severing movement.

7. A core drill comprising, in combination: a drill body formed with an axial core passage and a chamber opening thereinto; a core cutting and supporting member housed in said chamber normally in a position to leave said passage unobstructed; a pressure cylinder adjacent said member; an explosive charge in said cylinder; electrical means to ignite the charge at will of the operator; and means whereby fluid pressure in said cylinder acts to move said member to passage obstructing position.

8. The combination of claim 'I in which the cylinder is normally housed in a recess in said member and slidably related thereto.

ROBERT S. MANN. 

